Authors

Abstract

Precision fertilization is one of the important links in the precision agricultural operation system. In recent years, the demand for precision fertilization in facility greenhouse has become more and more urgent. As such, this paper designs an accurate and practical fertilization on-line monitoring system. The system adopts capacitance conversion chip PCAP01 and SCM STM32F103C8T6 to build a capacitance detection circuit. The effective acquisition of differential capacitance sensor microcapacitor signal output under this system is realized. The response relationship between the mass flow and the sensor capacitance output was studied, and a linear fitting model of fertilization was established. According to the prediction, the model determination coefficient was 0.9997. The experiment shows that the system has good adaptability to ambient temperature. The average measurement error is 1.13%, which meets the technical requirements of flow measurement. The capacitive fertilization online measurement system provides an effective way for the on-line acquisition of fertilization flow. It is of great significance for the implementation of high-precision variable fertilization.

Abstract in Chinese

精准施肥是精准农业运营体系中的重要环节之一。近年来，人们对设施温室精准施肥的需求越来越迫切。本文主要设计了一套准确实用的施肥在线监测系统。系统采用电容转换芯片PCAP01和单片机STM32F103C8T6搭建电容检测电路，实现了差分电容传感器微电容信号输出的有效采集。研究了质量流量与传感器电容输出的响应关系，建立了线性拟合模型。模型确定系数为0.9997，并通过预测验证了模型。实验表明，该系统对环境温度具有良好的适应性，平均测量误差为1.13%，可以满足流量技术要求。电容式施肥量在线测量系统为施肥机施肥流量的在线获取提供了有效途径，对实现高精度变量施肥作业具有重要意义。